Users Guide

The C-Series and S-Series cannot count both packets and bytes, when you enter the
count byte options, only bytes are incremented.
NOTE: When you configure ACL logging and byte counters simultaneously, byte
counters may display an incorrect value. Configure packet counters with logging
instead.
Related
Commands
• deny tcp — assign a filter to deny TCP packets.
• deny udp — assign a filter to deny UDP packets.
• ip access-list extended — create an extended ACL.
deny icmp
To drop all or specific internet control message protocol (ICMP) messages, configure a filter.
Syntax
deny icmp {source mask | any | host ip-address} {destination mask
| any | host ip-address} [dscp] [count [byte] [order] [fragments]
[no-drop]
To remove this filter, you have two choices:
• Use the no seq sequence-number command if you know the filter’s sequence
number.
• Use the no deny icmp {source mask | any | host ip-address}
{destination mask | any | host ip-address} command.
Parameters
source Enter the IP address of the network or host from which the
packets were sent.
mask Enter a network mask in /prefix format (/x) or A.B.C.D. The mask,
when specified in A.B.C.D format, may be either contiguous or
non-contiguous.
any Enter the keyword any to specify that all routes are subject to
the filter.
host ip-address Enter the keyword host then the IP address to specify a host IP
address.
destination Enter the IP address of the network or host to which the packets
are sent.
dscp Enter this keyword dscp to deny a packet based on the DSCP
value. The range is from 0 to 63.
count (OPTIONAL) Enter the keyword count to count packets
processed by the filter.
byte (OPTIONAL) Enter the keyword byte to count bytes processed
by the filter.
Access Control Lists (ACL) 257